I've been seing Teflon wrist pin buttons for sale for a long time (years). Do these things fail? I understand they get installed in place of the clips that normally come with a new piston.

Has anyone here ever used these things?

R

Used them for years on the race cars....they positively locate the wrist pin (good thing). Drawbacks would be additional weight over spring locks and the teflon can groove the cylinder over a period of time.

QUOTE (SLITS @ Mar 14 2005, 03:55 PM)

Used them for years on the race cars....they positively locate the wrist pin (good thing). Drawbacks would be additional weight over spring locks and the teflon can groove the cylinder over a period of time.

So why is that a good thing?


Andrew

QUOTE (phantom914 @ Mar 14 2005, 04:58 PM)

QUOTE (SLITS @ Mar 14 2005, 03:55 PM) Used them for years on the race cars....they positively locate the wrist pin (good thing).  Drawbacks would be additional weight over spring locks and the teflon can groove the cylinder over a period of time. So why is that a good thing? Andrew

Under severe conditions, the spring lock can pound out and you have a loose wrist pin that is going to REALLY groove the cylinder wall QUICKLY (plus the probability of a few other things happening).

QUOTE (SLITS @ Mar 14 2005, 07:55 PM)

<snip> Used them for years on the race cars <snip>

...how about for a street car? I'm not the biggest fan of the stock clips.

QUOTE (SLITS @ Mar 14 2005, 04:00 PM)

QUOTE (phantom914 @ Mar 14 2005, 04:58 PM) QUOTE (SLITS @ Mar 14 2005, 03:55 PM) Used them for years on the race cars....they positively locate the wrist pin (good thing).  Drawbacks would be additional weight over spring locks and the teflon can groove the cylinder over a period of time. So why is that a good thing? Andrew Under severe conditions, the spring lock can pound out and you have a loose wrist pin that is going to REALLY groove the cylinder wall QUICKLY (plus the probability of a few other things happening).

So the wrist pin slaps back and forth and pounds out the clip? At what sort of extremes are the buttons useful? Not on a steet car I bet. The wear on the cylinder would outweigh the benefits on a streetcar I would think. And they are used instead of the clips, not in addition to them, correct?


Andrew

The buttons are used instead of the clips. If you are builing a stock motor, stick with the clips, If you are increasing displacement and RPM's use the buttons. I have used them on Type I motors for awhile. MHO

You can always replace the standard spiral lock with a real circlip--the kind with tits on it to grab with circlip pliers--but find the ones made of tempered steel--not the standard steel--they will never come out--and weigh comparably to standard.